We propose a model elucidating the readout mechanism of the super resolution near-field structure (super-RENS) with an elliptic-bubble structure. The temperature dependence of the complex refractive index of Ge 2 Sb 2 Te 5 is determined by in situ ellipsometry. The complex refractive index of Ge 2 Sb 2 Te 5 shows quite an abrupt change at approximately 608°C. The temperature profile is calculated using a proposed first-order differential equation. Above the threshold readout power, Ge 2 Sb 2 Te 5 is locally heated over the critical temperature when thickest region of Ge 2 Sb 2 Te 5 is in commensurate with the center position of the Gaussian laser power distribution, which results in the abrupt amplification of signal-to-noise ratio (SNR) of the calculated reflectance. Thus, a model revealing the essential aspect of the elliptic-bubble super-RENS is proposed to elucidate its readout mechanism.
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Kim et al. (2006) studied this question.
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